Tubular stem.—A species of Sempervivum, exhibited by Mr. Salter, of Hammersmith, at one of the summer exhibitions of flowers at the Royal Horticultural Society in 1868, under the name of S. Bollei, deserves notice from its bearing on the question of such structures as the calyx-tubes, the hip of the rose and such like, [see pp. 394], [482]. In this plant the leaves appeared to be arranged some on the outside, others on the inside, of an erect hollow cylinder, some six inches in height. The oldest leaves were outside, the youngest within, so that the appearance presented was as if the summit of the axis had been pushed or drawn in, much as the finger of a tight glove might be invaginated in withdrawing it from the hand.

The plant in question thus furnishes an actual illustration of the supposititious case mentioned at [p. 482.]

Double flowers, [see pp. 499], et seq.—The following species may be added to those already recorded: Lychnis coronaria, Hibiscus mutabilis, Lotus major, Pisum sativum, Godetia sp., Ipomœa purpurea, Convolvulus minor, Heliotropium peruvianum, Trillium grandiflorum, and Phaius grandiflorus.

INDEX TO SUBJECTS.

A.

B.

C.